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A group of researchers have concluded that some laser printers emit dangerous particles when used. These particles are similar to those that are found in cigarette smoke. One printer tested actually releases particles at a level similar to what you would get by actually smoking, so it would seem that laser printers may be as hazardous to your health. There is a post about the study on CyberNet News at http://tech.cybernetnews....mful-as-cigarette-smoking, and it was initially reported by VNUNet.com (http://www.vnunet.com/vnu...printers-seriously-damage).

Of the 62 printers tested, only 17 emitted particles that may be hazardous to your health. The article was published by the American Chemical Society, and is not publically accessible at this time. If you can access their online article repository, you can read the whole thing (see the article citation at the end of this post). The university that my wife attends has a subscription, so I was able to read the study. Most of the article is pretty hard to follow, but here is the list of tested printers and the results:

someone was telling me they saw a programme on the tele here about it.They were saying it was very bad to sleep in the same room as a laser printer - presumably one that emits these dodgy particles.. ..which made me wonder are they even dodgy if you dont use them much

The study found that indoor particle levels in the office air increased fivefold during work hours due to printer use. Printers emitted more particles when operating with new toner cartridges and when printing graphics and images that require greater quantities of toner.

Good question. I suspect the particles are released when the printer is used. But how long they then stay in the air in the room is another question.

Another thing I'm curious about: does the type and brand of toner makes a noticeable difference here (for the same printer)? Cheap, alternative toners from 3rd party no-name manufacturers are pretty common. When it comes to ink catridges I usually go with the 3rd party brand for my personal usage. It's usually about half the cost and I have a hard time finding any real differences in printing quality. I've had pretty much the same approach when it comes to laser toner but but this new particle risk scenario may change my mind about that...